Java 如何检查一个整数是否是一个完全平方数
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How to check if an integer is a perfect square
提问by Brooke
How could I write an if-then statement that checks if an inputted integer is a perfect square or not (i.e. if I took the square root, it would be an integer as well: 4, 9, 16, 25, 36, etc.) in DrJava? Thank you!
我怎么能写一个 if-then 语句来检查输入的整数是否是一个完美的平方（即，如果我取平方根，它也将是一个整数：4、9、16、25、36 等？ ) 在 DrJava 中？谢谢！
采纳答案by Jaskaranbir Singh
I am aware that this question already has an answer.... But just in case, this also works.
我知道这个问题已经有了答案......但以防万一，这也有效。
int x = (int) Math.sqrt(input);
if(Math.pow(x,2) == input)
//Do stuff
